本實驗以固態反應法製備Sr2SiO4:Eu3+螢光體,在合成的過程中,先藉由不同參數,含SrCO3與SiO2的不同mole比、煆燒溫度、持溫時間與B2O3助熔劑添加量來確定合成母體Sr2SiO4純相的最佳參數,接著探討在不同摻雜激活劑Eu3+的濃度、燒成溫度、持溫時間與B2O3添加量對於螢光體發光特性之影響。再觀察加熱對於Sr2SiO4:Eu3+螢光體熱穩定性的影響,由實驗結果顯示,Eu3+之 f→f躍遷光譜呈現出尖銳的線性光譜,以近紫外光波長395nm為激發波長可得最佳的放射光譜,而得到放射峰為618nm的紅光放射,此發光躍遷主要為5D0→7FJ(J=0,1,2,3,4)的躍遷,放射光譜主要出現在578nm(5D0→7F0)、589nm(5D0→7F1)618nm(5D0→7F2)、650nm(5D0→7F3)、702nm(5D0→7F4)的峰值,且發光強度隨著激活劑添加量增加而上升,當Eu摻雜量為5mole%時,有最佳發光強度,超過此摻雜量後即產生濃度消光,並在1300°C、持溫3小時、添加5wt%B2O3時有最佳的發光強度。此外,Sr2SiO4:Eu3+螢光體的發光強度會隨著溫度的增加而降低,在升溫至150°C時,波長開始有藍移產生。
The study used the solid state reaction to prepare the Sr2SiO4:Eu3+phosphor,.We found the optimal parameters to synthesize the Host, Sr2SiO4 ,by different parameters including the mix ratio of SrCO3 and SiO2、different calcined temperature、holding time、different B2O3 concentration.We probe the influence of luminescence characteristic on Sr2SiO4:Eu3+ phosphors by different doping concentration of Eu、calcined temperature、holding time and B2O3 concentration,respectively,then we observed the influence of thermal stability.The result shows the sharp emissiom peak at 618nm that attributed to the typical f→f transition of Eu3+, whereas the emission peaks﹕578nm、589nm、618nm、650nm、702nmare attributed to the Eu3+ 5D0→7FJ=0 to 4 multiplets transition at the excitation 395nm. The luminous intensity increased as raising the concentration of activator, and the maximum luminous intensity was observed with Eu 5mole%、B2O3 5wt% ,and fired at 1300°C for 3 hours. In addition, luminous intensity of Sr2SiO4:Eu3+ phosphor reduces as the temperature increases, and the wavelength peak has blue shift excess 150°C.